t.p.r.AccessorType(type) : class documentation

Using this metaclass for your class will give you explicit accessor
methods; a method called set_foo, will automatically create a property
'foo' that uses set_foo as a setter method. Same for get_foo and
del_foo.

Note that this will only work on methods that are present on class
creation. If you add methods after the class is defined they will not
automatically become properties. Likewise, class attributes will only be
used if they are present upon class creation, and no getter function was
set - if a getter is present, the class attribute will be ignored.

This is a 2.2-only alternative to the Accessor mixin - just set in your
class definition: